Symphyotrichum potosinum (A.Gray) G.L.Nesom

Santa rita mountain aster (en)

Species

Angiosperms > Asterales > Asteraceae > Symphyotrichum

Characteristics

Perennials, 15–35(–45) cm, colonial or cespitose; rhizoma-tous. Stems 1–3+, ascending to erect (sometimes purple or purplish brown), glabrous or glabrate, sparsely hairy in leaf axils [villous to sericeous]. Leaves thin, apices callous-pointed, faces glabrous or glabrate; basal usually withering by flowering, long-petiolate, petioles sheathing, sparsely ciliate, blades lanceolate, 40–110 × (3–)5–7 mm, bases attenuate, margins entire to crenulate, rarely with 1–2 teeth, apices obtuse to rounded, callus-pointed; proximalmost cauline sometimes withering by flowering, winged-petiolate or sessile distally, blades lanceolate to linear-lanceolate, 50–120(–180) × 1–6 mm, bases attenuate, margins entire, sparsely ciliate, apices acute; distal sessile, blades subulate to lanceolate, 10–50 × 1–2 mm, bases clasping, apices acuminate. Heads (1–)3–20(–40), in paniculiform arrays, branches patent. Peduncles 1–4(–6) cm, ascending, glabrate, bracts 1–4(–5), subulate to lanceolate, foliaceous. Involucres cylindric to hemispheric, (4.5–)5–7.3 mm. Phyllaries in 2–3(–5) series, subulate to lanceolate, bases indurate, margins hyaline, entire to erose, often ciliate, green zones linear-lanceolate (outer) or rhombic (inner), apices acute, faces glabrous [sparsely villous]. Ray florets 14–27; corollas white, laminae (4.6–)5.6–7(–9.5)–10.3 × 1.3–2 mm. Disc florets 18–35(–42); corollas yellow, 3.5–5 mm, tubes shorter than funnelform throats (hairy), lobes± spreading, triangular, 0.5–0.7 mm. Cypselae light brown to gray, narrowly obovoid to fusiform, sometimes ± compressed, 2–3 mm, 5-nerved, faces glabrate to sparsely strigillose; pappi white to cream, 3.5–5.5 mm. 2n = 10.
Life form perennial
Growth form herb
Growth support free-standing
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Sexuality hermaphrodite
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Hardiness (USDA) 8-11

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Cultivation

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Images

Symphyotrichum potosinum unspecified picture

Distribution

Symphyotrichum potosinum world distribution map, present in Mexico and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:981882-1
WFO ID wfo-0000135323
COL ID 53Q93
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Symphyotrichum potosinum Aster lemmonii Aster potosinus